All-fiber optical nonreciprocity based on parity-time-symmetric Fabry-Perot resonators

Abstract

Optical nonreciprocity is of fundamental importance for signal processing in modern optical communication systems but is still facing issues on either high energy consumption, complicated design or on-chip integration. Here, an all-fiber device, containing two mutually coupled Fabry-Perot resonators to realize broken parity-time (PT) symmetry is demonstrated, which may find applications in software-defined optical networks.